Explosive-engine.



J. T. CURTIS.

EXPLOSIVE ENGINE.

APPLICATION FILED AUG.20, 1914.

1,;l4=1,443, Patented June 1, 1915.

3 SHEETS-SHEET I.

l vtneooeo 7 U atfozwu a Tm? NORRI" PETbR': ca, Pl lOTO-LITHQ. WASHINGTON, D. I

J. T. CURTIS.

EXPLOSIVE ENGINE.

APPLICATION FILED AuG.20. 1914.

1,141,443. I PatentedJune 1, 1915.

3 SHEETS-SHEET 2.

Q/vi hwoom THE NORRIS PETERS C0,. FHOIO LITHQ. WASH/Nb TON D C J. T. CURTIS.

EXPLOSIVE ENGINE.

APPLICATION FILED AUG.20 1914- 1 141 443 Patented June 1, 1915.

3 SHEETSSHEET 3.

1 7, 6a vials THE NORRIS PETERS 60., PHOTOVLIKHO WASHINGTON. I)

UNETED TATE PATENT @FFllQE.

Jessie TEMPLE CURTIS, or BEMENT, ILLINOIS.

EXPLOSIVE-ENGINE.

To all whom itmag concern.-

.Be it known that I, Jnssn T. CURTIS, a

citizenof the :United' States, residing at Bement, in the county of Piatt and State of tion engines, and as an object of the invention it is the a1m to provlde a simple, ef-

ficient and practical motor of this nature, in "which the intake and the exhaust are positive in action, and in which the noise and friction of the moving parts are reduced'to a minimum. Another object of the inventlon 1s to provide an engineof this nature, which may be manufactured cheaply, and the cost of re pairing reduced to a minimum. nother obj ect'of the invention 1s the provision of the main or dominant, explosive chamber, in which the main piston is operable, andthe auxiliary chamber in which the auxiliary piston intake controlling valve operates, which controls the intake of the charge and theexhaust of the utilized gases,

' both pistons at the same time constituting power developing elements, for imparting motion to the usual crank shaft of the crank casing, this being the design of the invention, that the auxiliary piston makes onehalf as many strokes as the main piston.

In practical fields the details of construction may necessitate alterations, falling Within the scope of what is claimed. 40

The invention comprises further features and combination of parts, as hereinafter set forth, shown in thedrawings and claimed. In the drawings :Figure 1 is a vertical f sectional view through the casing of the engine, showing the relative positions of the main and auxiliary pistons at the time of the intake of a charge. Fig. 2 is a similar view showing the relative positions of the main and auxiliary pistons at the time of compressing the charge. Fig. 3 is a view similar to Figs. 1 and 2 showing the positions of the main and auxiliary pistons after the charge has been fired. Fig. 4 is a sectional view similar to Figs. 1, 2, and 3 show- Specification of Letters Patent.

Patented June 1, 1915.

Application filed August 20, 1914. Serial No. 857,657.

ing the main piston in the act of cleaning the dominant chamber of the utilized gases, which pass out through the exhaust port and after the dominant chamber has been cleaned the main piston moves downwardly, and as it reaches the limit of its downward stroke at this period, the auxiliary piston reaches the limit of its upward stroke,

in view of which it will'be seen that the position of the pistons will again assume positions as shown in Fig. 1 in order that another charge may be taken into the dominant chamber so as to be compressed and fired. Fig. 5 is a. transverse sectional view on line 55 of Fig. 1.

v Referring more particularly to the drawin s 1 desi nates the usual crank casin in which the main crank shaft 2 is mounted in bearings, which crank shaft may have two fly wheels, in order to lend momentum to the shaft, only one fly wheel being illustrated, as designated at 3., Above the crank casing the main piston casing 4 is provided having the dominant explosive chamber 5 and the auxiliary piston valve chamber 6, in communication with the chamber 5 by virtue of the port 7. Surrounding the casing 4' is the usual water jacket 8, thereby providing the water space 9 for keeping the dominant and auxiliary chambers 5 and 6 cool. The usual sparking plug 10 is provided having the sparking terminals 11.

Mounted to reciprocate in the chamber 5- is the main or dominant piston 12 provided" with the usual packing rings 13. Pivoted upon the pin 14 of the piston 12 is the usual pitman rod 15, which in turn is pivoted at 16 to the crank 17 of the crank shaft 2. Mounted to reciprocate in the auxiliary chamber 6 is the auxiliary piston valve 18 having the usual packing 19, and provided adjacent the lower portion or end thereof with a reduced portion 20, forming an an nular channel 21. Connected pivotally at 22 to the lower end of the piston valve 18 is a pitman rod 23, which in turn has connections 24c, 25, 26 and 27 with the shaft 2,

speed as the piston 12. The casing 4 is provided with the intake ports 28 and 29 and the exhaust port 30.

To lubricate the movingparts the crank casing is supplied with lubricant, which lubricates the shaft 2 and the crankand the.

connections between the shaft 2 and thepitman 23, and as these parts are in the act of moving the lubricant is splashed-upon the lower portions of the pistons, thereby lubricating them. v, The port 7 remains opened all the tlme.

The port 29 is so arranged in the wall between the chamber 6 andthe chamber 5,

that it is opened following the suction stroke of the piston 12, and is covered or closed by the valve piston 18 followingthe explosion stroke. a The particular .advan' tags in this two chamber, two piston, four cycle engine is thesimplicity of construction, and the placing of the intake port near the lower endof the cylinder permits the control'cn both theintake and the exhaust ports with an auxiliary piston valve workmg in QOIlJlIIlCtlOIl w1th the ma n p ston, wh1ch'reduces the wear upon the moving parts to a minimum. The use of the two simple pistons'in' this form of engine together with the usual packing rings, permits the sealing of. the main and auxiliary chambers againstloss of compression and explosion, which has been proven to be the I mostreliable way of obtainingperfect com 'pression and retention of the explosive r es. 1

Operation: Referring to Fig. 1 it will be seen, that a charge is being sucked in through theintake ports 28 and 29, through theannular channel 21. The dominant piston 12 then makes its upward stroke, the

exhaust port 30 being closed, thereby com.- pressing the charge. However, beforethe 7 charge issucked. into the chamber 5 the piston 12 uncovers the port 29. As the piston '12 moves toward the port 29, a suction is created," 'and when the piston '12 reaches the port 29, the suction is so great at the -time o.t opening the ports28 and 29 that a sufficient charge is immediately drawn or sucked into the chamber 5, by way of the ports 28 and 29 and the channel 21. As

jbefore stated, the piston 12 then continues upwardly and compresses said charge. The

piston18 remains 'practically in the position shown in Fig.2, until the charge is compressed, Immediately following .the

compressionof the charge thefiring takes place, and the expansion of the gases imparts downward movements to the dominant and auxiliary pistons, and as the dominant piston 12 reaches the limit ofits downward stroke, the auxiliary v or supplementalv pi ston 18 uncovers the exhaust port 30, andre-- mainsiuncovered until the dominant piston,

12 makes another upward stroke, thereby scavenging the chamber 5 and forcing the utilized gases out through the exhaust port,

and as the dominant piston 12 again reaches the limit of its upward stroke, the exhaust V is clafined as new and useful is ort is (51556613 b "the amass for ap schambers, pistons operabletherein', one being a dominant piston andthe other an aux- 'ilia'ry piston',aniexhaust port in the aux ilia'ry chambena port of communication be tween the i ipper end'ofthe dominant and auxiliary chambers offset-above said exhaust port and being 'open' during )the working strokes of said pistons, a'p'ort of ,communt cationbetween the lower portions of the dominant and auxiliary chambers, 'anjntake port in the lower. portion of the auxiliary chambenofi'set below the port 'ofcomrnunication between the lower end of the auxiliary dominant chambers, said auxiliarypiston having means forming communicationsbetween the intake port the explosion chamber through the lower port of communication between the dominant or explosion chamber and the auxiliary chamber whenithedominantpiston is at the limitofj its d o wnward strokepan'd means of connection between the dominant and auxiliary pistons whereby the auxiliary piston. is held substantially at its limit of its upward stroke with the exhaustport closed while the do'minant piston is making its compression stroke,

the firing of the charge; immediately 'following the compression strokethere'by forcing both (pistons downwardly.

.2111 an internal combustion eng'ine, a

casing nav'irggdominant and auxiliary cham- V bers ,vp1stons operable therein, Jone being a dominant 'piston and the other an {auxiliary 'p1StQIl,, an exhaust port 1n the "auxiliary chamber, a port of communication between theupper end of the dominant and auxiliary being .open during the working strokes of said p1stons, a port of communication between the lower portions of the dominant and auxiliary chambers, an intake port in the lower portion of the auxiliary chamber o'flset anew, the port of communication between the lower end or the auxiliary and dominant chambers, saidfa'uxiliary piston having annular channel adjacent its lewer portion forming communication between the intake port and the explosion chamber through the port of communication between the lower portions of thedominant or "explosion and auxiliary chambers when the dominant piston is at the limitof its downwa rd stroke, andmeans of connection between the dominant and auxiliary pistons whereby the auxiliary piston is held chambers offset above said exhaust port and substantially at its limit of its upward stroke name to this specification in the presence of with the exhaust portkclosed while the domitwo subscribing Witnesses. nant iston is ma in its com ression stroke, the firing of the dharge imm ddiately JESSE TEMPLE CURTIS 5 following the compression stroke thereby Witnesses:

forcing both pistons downwardly. MAYME E. MGNAMEE,

In testimony whereof I have signed my ETHEL ANDERSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

